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                        <h1 id="45-&#x6570;&#x7EC4;&#x95F4;&#x8FD0;&#x7B97;">4.5 &#x6570;&#x7EC4;&#x95F4;&#x8FD0;&#x7B97;</h1>
<h2 id="&#x5B66;&#x4E60;&#x76EE;&#x6807;">&#x5B66;&#x4E60;&#x76EE;&#x6807;</h2>
<ul>
<li>&#x76EE;&#x6807;<ul>
<li>&#x77E5;&#x9053;&#x6570;&#x7EC4;&#x4E0E;&#x6570;&#x4E4B;&#x95F4;&#x7684;&#x8FD0;&#x7B97;</li>
<li>&#x77E5;&#x9053;&#x6570;&#x7EC4;&#x4E0E;&#x6570;&#x7EC4;&#x4E4B;&#x95F4;&#x7684;&#x8FD0;&#x7B97;</li>
<li>&#x8BF4;&#x660E;&#x6570;&#x7EC4;&#x95F4;&#x8FD0;&#x7B97;&#x7684;&#x5E7F;&#x64AD;&#x673A;&#x5236;</li>
</ul>
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<hr>
<h2 id="1-&#x6570;&#x7EC4;&#x4E0E;&#x6570;&#x7684;&#x8FD0;&#x7B97;">1 &#x6570;&#x7EC4;&#x4E0E;&#x6570;&#x7684;&#x8FD0;&#x7B97;</h2>
<pre><code class="lang-python">arr = np.array([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">4</span>], [<span class="hljs-number">5</span>, <span class="hljs-number">6</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>]])
arr + <span class="hljs-number">1</span>
arr / <span class="hljs-number">2</span>

<span class="hljs-comment"># &#x53EF;&#x4EE5;&#x5BF9;&#x6BD4;python&#x5217;&#x8868;&#x7684;&#x8FD0;&#x7B97;&#xFF0C;&#x770B;&#x51FA;&#x533A;&#x522B;</span>
a = [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">4</span>, <span class="hljs-number">5</span>]
a * <span class="hljs-number">3</span>
</code></pre>
<h2 id="2-&#x6570;&#x7EC4;&#x4E0E;&#x6570;&#x7EC4;&#x7684;&#x8FD0;&#x7B97;">2 &#x6570;&#x7EC4;&#x4E0E;&#x6570;&#x7EC4;&#x7684;&#x8FD0;&#x7B97;</h2>
<pre><code class="lang-python">arr1 = np.array([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">4</span>], [<span class="hljs-number">5</span>, <span class="hljs-number">6</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>]])
arr2 = np.array([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">4</span>], [<span class="hljs-number">3</span>, <span class="hljs-number">4</span>, <span class="hljs-number">5</span>, <span class="hljs-number">6</span>]])
</code></pre>
<p>&#x4E0A;&#x9762;&#x8FD9;&#x4E2A;&#x80FD;&#x8FDB;&#x884C;&#x8FD0;&#x7B97;&#x5417;&#xFF0C;&#x7ED3;&#x679C;&#x662F;&#x4E0D;&#x884C;&#x7684;&#xFF01;</p>
<h3 id="21-&#x5E7F;&#x64AD;&#x673A;&#x5236;">2.1 &#x5E7F;&#x64AD;&#x673A;&#x5236;</h3>
<p>&#x6570;&#x7EC4;&#x5728;&#x8FDB;&#x884C;&#x77E2;&#x91CF;&#x5316;&#x8FD0;&#x7B97;&#x65F6;&#xFF0C;<strong>&#x8981;&#x6C42;&#x6570;&#x7EC4;&#x7684;&#x5F62;&#x72B6;&#x662F;&#x76F8;&#x7B49;&#x7684;</strong>&#x3002;&#x5F53;&#x5F62;&#x72B6;&#x4E0D;&#x76F8;&#x7B49;&#x7684;&#x6570;&#x7EC4;&#x6267;&#x884C;&#x7B97;&#x672F;&#x8FD0;&#x7B97;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5C31;&#x4F1A;&#x51FA;&#x73B0;&#x5E7F;&#x64AD;&#x673A;&#x5236;&#xFF0C;&#x8BE5;&#x673A;&#x5236;&#x4F1A;&#x5BF9;&#x6570;&#x7EC4;&#x8FDB;&#x884C;&#x6269;&#x5C55;&#xFF0C;&#x4F7F;&#x6570;&#x7EC4;&#x7684;shape&#x5C5E;&#x6027;&#x503C;&#x4E00;&#x6837;&#xFF0C;&#x8FD9;&#x6837;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x8FDB;&#x884C;&#x77E2;&#x91CF;&#x5316;&#x8FD0;&#x7B97;&#x4E86;&#x3002;&#x4E0B;&#x9762;&#x901A;&#x8FC7;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x8FDB;&#x884C;&#x8BF4;&#x660E;&#xFF1A;</p>
<pre><code class="lang-python">arr1 = np.array([[<span class="hljs-number">0</span>],[<span class="hljs-number">1</span>],[<span class="hljs-number">2</span>],[<span class="hljs-number">3</span>]])
arr1.shape
<span class="hljs-comment"># (4, 1)</span>

arr2 = np.array([<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>])
arr2.shape
<span class="hljs-comment"># (3,)</span>

arr1+arr2
<span class="hljs-comment"># &#x7ED3;&#x679C;&#x662F;&#xFF1A;</span>
array([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>],
       [<span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">4</span>],
       [<span class="hljs-number">3</span>, <span class="hljs-number">4</span>, <span class="hljs-number">5</span>],
       [<span class="hljs-number">4</span>, <span class="hljs-number">5</span>, <span class="hljs-number">6</span>]])
</code></pre>
<p>&#x4E0A;&#x8FF0;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6570;&#x7EC4;arr1&#x662F;4&#x884C;1&#x5217;&#xFF0C;arr2&#x662F;1&#x884C;3&#x5217;&#x3002;&#x8FD9;&#x4E24;&#x4E2A;&#x6570;&#x7EC4;&#x8981;&#x8FDB;&#x884C;&#x76F8;&#x52A0;&#xFF0C;&#x6309;&#x7167;&#x5E7F;&#x64AD;&#x673A;&#x5236;&#x4F1A;&#x5BF9;&#x6570;&#x7EC4;arr1&#x548C;arr2&#x90FD;&#x8FDB;&#x884C;&#x6269;&#x5C55;&#xFF0C;&#x4F7F;&#x5F97;&#x6570;&#x7EC4;arr1&#x548C;arr2&#x90FD;&#x53D8;&#x6210;4&#x884C;3&#x5217;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x901A;&#x8FC7;&#x4E00;&#x5F20;&#x56FE;&#x6765;&#x63CF;&#x8FF0;&#x5E7F;&#x64AD;&#x673A;&#x5236;&#x6269;&#x5C55;&#x6570;&#x7EC4;&#x7684;&#x8FC7;&#x7A0B;&#xFF1A;</p>
<p><img src="image/image-20190620005224076.png" alt="image-20190620005224076"></p>
<p>&#x5E7F;&#x64AD;&#x673A;&#x5236;&#x5B9E;&#x73B0;&#x4E86;&#x65F6;&#x4E24;&#x4E2A;&#x6216;&#x4E24;&#x4E2A;&#x4EE5;&#x4E0A;&#x6570;&#x7EC4;&#x7684;&#x8FD0;&#x7B97;&#xFF0C;&#x5373;&#x4F7F;&#x8FD9;&#x4E9B;&#x6570;&#x7EC4;&#x7684;shape&#x4E0D;&#x662F;&#x5B8C;&#x5168;&#x76F8;&#x540C;&#x7684;&#xFF0C;&#x53EA;&#x9700;&#x8981;&#x6EE1;&#x8DB3;&#x5982;&#x4E0B;&#x4EFB;&#x610F;&#x4E00;&#x4E2A;&#x6761;&#x4EF6;&#x5373;&#x53EF;&#x3002; </p>
<ul>
<li>1.&#x6570;&#x7EC4;&#x7684;&#x67D0;&#x4E00;&#x7EF4;&#x5EA6;&#x7B49;&#x957F;&#x3002; </li>
<li>2.&#x5176;&#x4E2D;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x7684;&#x67D0;&#x4E00;&#x7EF4;&#x5EA6;&#x4E3A;1 &#x3002;</li>
</ul>
<p>&#x5E7F;&#x64AD;&#x673A;&#x5236;&#x9700;&#x8981;<strong>&#x6269;&#x5C55;&#x7EF4;&#x5EA6;&#x5C0F;&#x7684;&#x6570;&#x7EC4;</strong>&#xFF0C;&#x4F7F;&#x5F97;&#x5B83;&#x4E0E;&#x7EF4;&#x5EA6;&#x6700;&#x5927;&#x7684;&#x6570;&#x7EC4;&#x7684;shape&#x503C;&#x76F8;&#x540C;&#xFF0C;&#x4EE5;&#x4FBF;&#x4F7F;&#x7528;&#x5143;&#x7D20;&#x7EA7;&#x51FD;&#x6570;&#x6216;&#x8005;&#x8FD0;&#x7B97;&#x7B26;&#x8FDB;&#x884C;&#x8FD0;&#x7B97;&#x3002;</p>
<p>&#x5982;&#x679C;&#x662F;&#x4E0B;&#x9762;&#x8FD9;&#x6837;&#xFF0C;&#x5219;&#x4E0D;&#x5339;&#x914D;&#xFF1A;</p>
<pre><code class="lang-python">A  (<span class="hljs-number">1</span>d array): <span class="hljs-number">10</span>
B  (<span class="hljs-number">1</span>d array): <span class="hljs-number">12</span>
A  (<span class="hljs-number">2</span>d array):      <span class="hljs-number">2</span> x <span class="hljs-number">1</span>
B  (<span class="hljs-number">3</span>d array):  <span class="hljs-number">8</span> x <span class="hljs-number">4</span> x <span class="hljs-number">3</span>
</code></pre>
<p><strong>&#x601D;&#x8003;&#xFF1A;&#x4E0B;&#x9762;&#x4E24;&#x4E2A;ndarray&#x662F;&#x5426;&#x80FD;&#x591F;&#x8FDB;&#x884C;&#x8FD0;&#x7B97;&#xFF1F;</strong></p>
<pre><code class="lang-python">arr1 = np.array([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">4</span>], [<span class="hljs-number">5</span>, <span class="hljs-number">6</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>]])
arr2 = np.array([[<span class="hljs-number">1</span>], [<span class="hljs-number">3</span>]])
</code></pre>
<h2 id="3-&#x5C0F;&#x7ED3;">3 &#x5C0F;&#x7ED3;</h2>
<ul>
<li>&#x6570;&#x7EC4;&#x8FD0;&#x7B97;,&#x6EE1;&#x8DB3;&#x5E7F;&#x64AD;&#x673A;&#x5236;,&#x5C31;OK&#x3010;&#x77E5;&#x9053;&#x3011;<ul>
<li>1.&#x7EF4;&#x5EA6;&#x76F8;&#x7B49;</li>
<li>2.shape(&#x5176;&#x4E2D;&#x5BF9;&#x5E94;&#x7684;&#x5730;&#x65B9;&#x4E3A;1,&#x4E5F;&#x662F;&#x53EF;&#x4EE5;&#x7684;)</li>
</ul>
</li>
</ul>

                    
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